Memories are often triggered by the presence of physical artifacts. When artifacts are replaced, the contemplation of a history attached to the artifacts tends to fade or even disappear. In an urban context, it often means that buildings and spaces which are the record of a culture are substituted with buildings and spaces that are disconnected from tradition in favor of a fast paced economy. China is the prime example of the largest and fastest urbanization over the past two decades. While it dramatically transformed most cities and suburban areas into modern urban organizations, large amounts of beautiful local architectures disappeared. This thesis proposes that architecture - no matter at what time is built - has the potential to embody a historic dimension and memories when seeking a symbiosis of traditional materials and modern technologies. The project here is a vehicle to seek memory to be evoked by the spatial scale and familiar materials without compromising modern requirements and conveniences. / 10 / Memories fade out when old things being replaced by new things. This is a common phenomenon that happens constantly in today's fast-paced world. Technological progress of construction increases the speed of urbanization, however, it erases good old memories in the same speed simultaneously. Take China as an example, the largest and fastest urbanization in the past two decades dramatically transformed most cities and suburban areas into modern appearances. Large amount of beautiful local architectures disappeared. This thesis explores ways to preserve those good memories through integrating traditional materials and modern technologies. Guests' memory will be evoked by experiencing the spatial scale and old materials while still having a modern lifestyle in a hotel.

Rammed earth is a technique of forming in-situ structural wall elements using rigid formwork. Advantages of rammed earth walls include flexibility in plan form, scope for adjusting strength and wall thickness, variety of textural finishes, lower embodied carbon and energy, etc. There is a growing interest in the construction of rammed earth buildings in the recent past. Well focused comprehensive studies in understanding the structural performance of rammed earth structures are scanty. Clear-cut guidelines on selecting soil grading and soil characteristics, assessing strength of rammed earth walls, density strength relationships, limits on shrinkage, standardised testing procedures, behaviour of rammed earth walls under in-plane and out of plane loads, etc are the areas needing attention. The thesis attempts to address some of these aspects of cement stabilized rammed earth for structural walls. Brief history and developments in rammed earth construction with illustrations of rammed earth buildings are presented. A review of the literature on rammed earth has been provided under two categories: (a) Unstabilised or pure rammed earth and (b) stabilised rammed earth. Review of the existing codes of practice on rammed earth has also been included. Summary of the literature on rammed earth along with points requiring attention for further R&D are discussed. Objectives and scope of the thesis are listed. The thesis deals with an extensive experimentation on cement stabilised rammed earth (CSRE) specimens and walls. Four varieties of specimens (cylindrical, prisms, wallettes and full scale walls) were used in the experiments. A natural soil and its reconstituted variants were used in the experimental work. Details of the experimental programme, characteristics of raw materials used in the experimental investigations, methods of preparing different types of specimens and their testing procedures are discussed in detail. Influence of soil grading, cement content, moulding water content, density and delayed compaction on compaction characteristics and strength of cement stabilised soil mixes were examined. Five different soil gradings with clay content ranging between 9 and 31.6% and three cement contents (5%, 8% and 12%) were considered. Effect of delayed compaction (time lag) on compaction characteristics and compressive strength of cement stabilised soils was examined by monitoring the results up to 10 hours of time lag. Influence of moulding water content and density on compressive strength and water absorption of cement stabilised soils was examined considering for a range of densities and water contents. The results indicate that (a) there is a considerable difference between dry and wet compressive strength of CSRE prisms, and the strength decreases as the moisture content at the time of testing increases, (b) wet strength is less than that of dry strength and the ratio between wet to dry strength depends upon the clay fraction of soil mix and cement content, (c) saturated moisture content depends upon the cement content and the clay content of the soil mix, (d) optimum clay percentage yielding maximum compressive strength is about 16%, (e) compressive strength of compacted cement stabilised soil increases with increase in density irrespective of cement content and moulding moisture content, and the strength increases by 300% for 20% increase in density from 15.70 kN/m3, (f) compressive strength of rammed earth is one - third higher than that of rammed earth brick masonry and (g) density decreases with increase in time lag and there is 50% decrease in strength with 10 hour time lag. Stress-strain relationships and elastic properties of cement stabilised rammed earth are essential for the analysis of CSRE structural elements and understanding the structural behaviour of CSRE walls. Influence of soil composition, density, cement content and moisture on stress-strain relationships of CSRE was studied. Three different densities (15.7 – 19.62 kN/m3) and three cement percentages (5%, 8% and 12% by weight) were considered for CSRE. Stress-strain characteristics of CSRE and rammed earth brick masonry were compared. The results reveal that (a) in dry condition the post peak response shows considerable deformation (strain hardening type behaviour) beyond the peak stress and ultimate strain values at failure (dry state) are as high as 3.5%, which is unusual for brittle materials, (b) modulus for CSRE increases with increase in density as well as cement content and there is 1 to 3 times increase as the cement content changes from 5% to 12%. Similarly the modulus increases by 2.5 to 5 times as the dry density increases from 15.7 to 19.62 kN/m3 and (c) the modulus of CSRE and masonry in dry state are nearly equal, whereas in wet state masonry has 20% less modulus. Compressive strength and behavior of storey height CSRE walls subjected to concentric compression was studied. The results of the wall strength were compared with those of wallette and prism strengths. The wall strength decreases with increase in slenderness ratio. There is nearly 30% reduction in strength as the height to thickness ratio increases from 4.65 to 19.74. It was attempted to calculate the ultimate compressive strength of CSRE walls using the tangent modulus theory. At higher slenderness ratios, there is a close agreement between the experimental and predicted values. The storey height walls show lateral deflections as the load approaches failure. The walls did not show visible buckling and the shear failure patterns indicate material failure. The shear failures noticed in the storey height walls resemble the shear failures of short height wallette specimens. The thesis ends with a summary of the results with concluding remarks in the last chapter.

Projekt "Växa mot Våtmarken" handlar om att skapa en byggnad som tar människan till naturen, och inte minst våtmarken. Nynäsvägen och järnvägen till Norviks hamn skapar idag barriärer för Nynäshamnsborna att ta sig till Alhagens våtmark, ett vackert naturområde med stora värden för naturen och människan. Med denna nya byggnad tillkommer ett våtmarksområde närmare bostadsområdena samtidigt som byggnaden visar vägen till Alhagen genom dess placering intill bron som leder dit. Byggnadens program ska främst fokusera på våtmarken och dess funktioner. Här finns en utställning, ett labb och interaktivt rum där förskolebarn kan leka, skolklasser kan undervisas och forskare kan studera våtmarken. Här kan även mindre rum och en öppen studie- och arbetsyta utnyttjas för de som vill studera eller arbeta nära naturen. Serveringen med utsikt över både den befintliga och nya våtmarken blir en attraktiv del i huset.  Materialen ska vara lokala och naturliga så att känslan av huset knyter samman med dess funktion. Vid bygget av dammar i den nya våtmarken kan den överblivna jorden bidra till att bygga upp bärande väggar mad stampad jord-teknik vilka kompletteras med KL-träpelare och täcks med ett biotoptak som fungerar likt en trädgård för allmänheten och som på samma sätt som våtmarken bidrar till biologisk mångfald och ett omhändertagande av vatten vid stora nederbörder. / Project "Towards the Wetland" is about creating a building that brings people to nature, and more specifically to the wetland. Road 73 and the railway to Norvik harbour currently create barriers for Nynäshamn residents to get to Alhagen's wetland, a beautiful area with great values for nature and people. With this new building, a wetland area is added closer to the residential areas, while the building shows the way to Alhagen through its location next to the bridge that leads there. The building's programme will focus primarily on the wetland and its functions. It includes an exhibition, lab and interactive space where preschoolers can play, school classes can be taught and researchers can study the wetland. Smaller rooms and an open study and work area can also be utilised for those who want to study or work close to nature. The cafeteria overlooking both the existing and new wetland will be an attractive part of the building.  Materials should be local and natural so that the feel of the building is linked to its function. In the construction of ponds in the new wetland, the leftover soil can contribute to the construction of load-bearing walls using rammed earth technology, which are supplemented with CLT columns and covered with a biotope roof that functions like a garden for the public and which, in the same way as the wetland, contributes to biodiversity and water management during heavy rainfall.

No description available.

Architecture has been primarily ocularcentric for the last century. This thesis proposes a more sensible approach to architecture. A multisensory experience that gives the user a deeper response to the building. Architecture can activate and engage multiple senses through the revelation of nature such as: wind, light, and shadow. Architecture has the power to reveal the essence of nature and natural phenomena. It can also become a catalyst to help us understand nature and attain a deeper connection with it and ourselves. Through derived forms and attention to details, architects can capture the essence of nature without direct imitation. Architecture has always had the power to reveal. The architect must choose what is revealed. This thesis is an exploration into the idea of architecture as a revelation of nature in a specific climate, location, and context to allow the user to become more attuned to nature. Architecture can allow the users to explore and discover nature in a way that was previously ignored or overlooked, or perhaps it can reveal a phenomenon for the first time. Architecture can reveal nature through: orientation, material choices, form, function, openings, details, and spacing. Allowing natural phenomena to be a part of the design process creates a building attuned to nature. These revelations can occur with careful consideration to components, conditions, and details such as: wind, light, shadow, and structure. In order to achieve these, special consideration must be give to the tectonic and stereotomic construction. / Master of Architecture

Pas de résumé en français disponible / Locally available building materials are proven energy efficient and eco-friendly, making them a sustainable building material. In the last two decades, use of raw earth as building material is augmented, owing to the environmental concerns construction industry is also reconsidering the use of raw earth, researchers on the other hand are working to understand the mechanical and dynamic behaviour of earthen buildings, yet the study of mechanical parameters possess multiple challenges due to material inert properties exposing the need of new experimental approaches to extract accurate mechanical parameters. Building techniques such as adobe, compressed earth blocks, rammed earth, and laterite building stones are on a verge of reclaiming elite position in construction industry. In this study, experimental investigation on two naturally available building materials, unstabilised rammed earth (USRE) and laterite building stones (LBS) are carried out. The work focuses on the parameters that need to be considered in the experimental procedures, which influences the mechanical properties of USRE and LBS are seen. The locally available soils in the region of Rhone-alps, France and laterite building stones from Burkina Faso are used in this experimental campaign. Rammed earth walls are constructed by compacting moist soil in layers, due to manufacturing technique there is a density gradient within the layer that leads to heterogeneity. On the other hand, the manufacturing parameters of the USRE such as compaction energy and manufacturing water content have a direct influence on the dry density of the material and therefore the strength. The manufacturing parameters and specimens replicating the in-situ condition are very important to understand the behaviour of USRE wall. Hence an experimental procedure to study the unconfined compressive strength, considering the influence of manufacturing parameters and specimens replicating in-situ conditions are performed along with the cyclic loading and unloading to study the elasto-plastic property of the USRE. The test procedure is performed on two different soils that are used to build USRE structures. Along with the compressive strength of USRE, the tensile strength and flexural strength are also presented by subjecting specimens under split tensile test and four point bending test. Another important parameter is the mechanical strength properties of USRE layer interface under lateral loads. A novel experimental procedure to study the interface strength properties are discussed in this study. The experimental procedure is simple and xii compact that can be performed using a simple uniaxial press using inclined metallic wedges that allows rectangular prism to undergo bi-axial loading. With the help of inclined metallic wedges, shear stress and normal stress can be induced on the specimen interface allowing to obtain coulomb’s failure criteria and hence the strength properties of the interface. Laterite building stones (LBS) which are mainly used in tropical countries are porous in nature. The moisture retention capacity of porous building material will bring indoor comfort, but the presence of water molecules within the material and their variation to the outdoor environment is responsible for complex mechanical behaviour. Hence an experimental investigation to analyse the moisture ingress of LBS and their influence on mechanical strength is designed. The moisture ingress is studied by subjecting LBS for moisture sorption and desorption test and moisture buffering test. Then the influence of moisture ingress on mechanical strength (flexure and compression) are investigated using three point bending test and unconfined compression test with loading and unloading cycles. This experimental investigation allows studying the moisture ingress and their influence on strength along with elasto-plastic behaviour of LBS.

Rammed earth is a monolithic construction formed by compacting processed soil in progressive layers. Rammed earth is used for the construction of load bearing walls, floors, sub base material in roadways, airport runways, taxiways, aprons, foundations and earthen bunds. Soil, sand, cement and water are the ingredients used for the preparation of cement stabilized rammed earth (CSRE) specimens. The cracking in a rammed earth structure is due to the development of tensile stresses. The tensile stresses are generated due to various causes like unequal settlement of foundation, eccentric loading and / or lateral loading such as wind pressure and earthquake on an earth structure. The cracking in a rammed earth structure causes the failure of its intended function. For example formation of crack may lead to the instability of an embankment slope. And earthen dam can be destroyed gradually by erosion of soil at the crack surface (Harison et al. 1994). Hence, it becomes important to understand the fracture behaviour of cement-stabilized rammed earth structures. Well focused studies in understanding the fracture behaviour of CSRE structures are scanty. The present work attempts to address some issues on the fracture behaviour of CSRE including size effect. Through an experimental programme material properties viz. compressive strength, tensile strength and stress-strain relationships are generated for two chosen densities, 17 and 18.5 kN/m3 of CSRE both in dry and saturated condition. Soil composition, density, cement content and moisture content of the specimen during testing influence the characteristics of CSRE. In the present investigation keeping the cement at 10%, the density is varied choosing a soil-sand mixture having optimum grading limits. The basic raw materials used are soil, sand, cement and water in the ratio of 1 : 1.5 : 0.25 : 0.34 by weight. The strength properties studied alone are inadequate to predict the mechanics of fracture due to the presence of microscopic flaws, cracks, voids and other discontinuities. Therefore, some linear elastic fracture parameters such as mode I fracture toughness (KIc), critical energy release rate (GIc), net section strength (f net) and notch sensitivity are calculated, presuming that CSRE is still a brittle material because it is yet to be confirmed that CSRE is a quasibrittle material. In fact, in the present work, it is shown that CSRE has significant amount of softening. A comprehensive experimental work has been undertaken to test CSRE beam specimens for two densities, three sizes of beam and three notch to depth ratios under three point bending (TPB) in a closed loop servo-controlled machine with crack mouth opening displacement control. Results indicate that the CSRE in dry condition exhibits a greater resistance to fracture than the saturated specimen. The variation of net section strength with the notch depth is not significant. Therefore the CSRE material is notch insensitive, implying that it is less brittle. An experimental program was undertaken to determine the nonlinear fracture parameters of beam specimens both in dry and saturated condition. The influence of moisture content, density, size of the specimen as well as notch to depth ratio of the specimen on RILEM fracture energy (G F ) are presented. The GF values increase with increase in density and size of the specimen, while they decrease with increase in notch to depth ratio. Results clearly show that the total energy absorbed by the beams (W OF ) and RILEM fracture energy (G F ) for all specimens tested in dry state are higher compared to the specimens tested in saturated state, indicating that the dry specimen offers higher resistance to the crack propagation. The RILEM fracture energy GF , determined from TPB tests, is said to be size dependent. The assumption made in the work of fracture is that the total strain energy is utilized for the fracture of the specimen. The fracture energy is proportional to the size of the fracture process zone (FPZ), which also implies that size of FPZ increases with increase in the un-cracked ligament (d - a) of beam. This also means that FPZ is proportional to the depth d for a given notch to depth ratio, because for a given notch/depth, (d - a) which is also is proportional to d because is a constant. This corroborates the fact that fracture energy increases with size. Interestingly, the same conclusion has been drawn by Karihaloo et al. (2006). They have plotted a curve relating fracture process zone length and overall depth the beam. In the present study a new method namely Fracture energy release rate method proposed by Muralidhara et al. (2013) is used. In the new method the plot of GF /(d - a) versus (d - a) is obtained from a set of experimental results. The plot is found to follow power law and showed almost constant value of GF /(d - a) at larger ligament lengths. This means the fracture energy reaches a constant value at large ligament lengths reaffirming that the fracture energy from very large specimen is size-independent. This Fracture energy release rate method is used to determine size-independent fracture energy GRf , based on the relationship between RILEM fracture energy and the un-cracked ligament length. The experimental results from the present work agree well with the proposed new method. Similarly, the method is extended to determine nominal shear strength τv for large size beam. Results show that for both densities GRf decrease in saturated condition, while in dry condition as the density is increased from 17 to 18.5 kN/m3 the GRf decrease by 7.58%, indicating that the brittleness increases with higher density. The τv for large size beam increases with density both in dry and saturated condition. The size effect method for evaluating material fracture properties proposed by Bazant (1984) is applied to cement stabilised rammed earth. By measuring the peak loads of 2D geometrically similar notched beam specimens of different sizes, nonlinear fracture parameters such as fracture energy (Gf ), fracture toughness (KIc), effective length of the fracture process zone (Cf ), brittleness number (β), characteristic length (l 0) and the critical crack tip opening displacement (CT ODc) are determined for both dry and saturated conditions. The crack growth resistance curves (R-curve) are also developed for dry and saturated specimens. In the size effect method, for both densities 18.5 and 17 kN/m3 the values of nonlinear fracture properties, namely G f , Cf , KIc, CT ODc and l 0 are lower for the saturated specimen compared to those of the dry specimen. In dry condition as the density is increased from 17 to 18.5 kN/m3 the Gf decreases to 13.54%, indicating that the brittleness increase with higher density. The areas under the load-displacement and load-CMOD curves are a measure of the fracture energy and these areas are low for saturated specimens. The crack growth resistance curves (R-curve) plotted using the size-effect law from peak loads are the measure of resistance against crack growth R. The value of R is high for dry specimen compared to that of the saturated specimens. During aggregate pullout or the opening of crack, the interlock or friction between the crack surfaces may cause the energy dissipation through friction and bridging across the crack. Therefore the wet friction in case of saturated specimen must be smaller resulting in more brittleness compared to the larger dry friction for dry specimen. In the present investigation the Digital Image Correlation (DIC) technique is used to study the FPZ properties in cement stabilised rammed earth. The MATLAB package written by Eberl et al. (2006) is suitably modified and used for image correlation to suit our requirements. CMOD measured using DIC technique is validated by comparison with the CMOD measured using clip gauge. The FPZ properties such as the development of FPZ and crack opening displacements at different loading points as well as the influence of notch/depth ratio on FPZ length (lFPZ ) are evaluated for both dry and saturated conditions. At peak load the lFPZ are about 0.315 and 0.137 times the un-cracked ligament length respectively for specimens tested under dry and saturated conditions. In dry and saturated states the FPZ length decreases as the ratio increases. Lower values of lFPZ in saturated specimen indicates that it is relatively more brittle compared to dry specimen.

As the placeless globalization is accelerating around the world and especially in China, places that have strong ties to the particularities of a locale are desirable destinations to escape the generic monotony of placeless urbanization. The thesis here stipulates that even in a placeless globalization, opportunities exist to understand, interpret and celebrate local cultural phenomena. While many formal architectural artifacts may have outgrown their purpose and no longer have direct relevance today, a number of desires, customs and rituals persist as desirable conditions to be supported by architectural space. The thesis proposes to seek out an architecture, that embraces and reinterprets targeted aspects of the built form of traditional elements with modern means. / Master of Architecture / This thesis discusses possibilities to reinterpret the vernacular. Specifically, the sense of identity generated by the architecture traditions in Western China can be attributed to shape and construction of the roof, organization in plan, the central fire place, and a protected courtyard all enclosed by rammed earth. Reinterpretations of those elements in modern forms propose a continuity of culture and identity.

This thesis thrives to promote community health and wellbeing through smart design, celebrating culture(s), and offering efficacious and real-world solutions to mitigate certain challenges arising from the imminent threat of climate change and the gradual depletion of our planet's natural resources. The projected building harnesses naturel forces, minimizes energy consumption, and uses natural/passive strategies like thermal mass and natural ventilation. Interior spaces enjoy an abundance of Natural lighting, biophilic attributes, and thera-serlized or uninterrupted views. It generates electrical energy due to adequate solar power and clear skies, especially in hot and arid climates like the proposed location of the project in Tuba City, AZ. In my proposal of a sustainable, community-focused, wellness center, this project will attempt to embrace diversity, celebrate the Navajos heritage through incorporating their belief system and culture into the genius Loci of the place, which will have a long-term healing effect on patients during their journey of recovery. The Navajo nation is a native American reservation and a self-governing community located in the southwest of the US between four states (UT, AZ, NM, CO). Since it's an Underserved, marginalized, and medically under-resourced community, the Navajo Nation was prone to COVID-19 onslaught in 2020, which resulted in substantial number of cases compared to other US states. / Master of Architecture / In Dec 2020, the World witnessed the first case of Coronavirus disease or COVID-19 in Wuhan, China. The disease has since spread rapidly worldwide, leading to an ongoing pandemic. Like many countries across the globe, the health system in the United States of America has to grabble with this deadly virus by inducing measures such as mask mandates and lockdowns in many US states. Unfortunately, and due to economic and social disparities, COVID-19 pandemic has brought injustice and inequity to the forefront of public health. Some communities were hit hard due to lack of emergency response, the availability of health professionals, and healthcare infrastructure. Tuba city, which is the Diné or the Navajo nation second-largest community in Coconino County, AZ, was majorly hit with COVID-19 resulting in a significant number of cases compared to other US cities. This project is a critical component of an emergency preparedness matrix that can firstly; help absorb the shock of such outbreaks by providing primary and outpatient services. Secondly; it offers community-focused and wellness service that can empower underserved, under-resourced and valuable communities like the Navajo Nation. This project is unique due to its inherited and embedded characteristics of bringing the Navajo tradition into the spirit of the building, by celebrating their culture making it a key component in a patent's healing process.

Rammed earth is one of the earliest building materials used for structural walls. Stabilised rammed earth is a variant of traditional or pure rammed earth that involves addition of a small amount of cement to improve strength and durability. Rammed earth buildings experience in-plane shear forces as well as flexural stresses due to out-of-plane bending especially during earthquakes. The thesis attempts to examine the behaviour of cement stabilised rammed earth wall elements and building models subjected to lateral loads. A brief introduction to rammed earth construction followed by a review of literature on rammed earth and details of the existing codes of practice on rammed earth is provided in Chapter 1. Chapter 2 deals with the flexural strength, modulus of rupture, stress-strain relationships and free vibration characteristics of cement stabilised rammed earth (CSRE) in greater detail. Properties of raw materials used in the experimental investigations followed by a detailed description of the experimental programme, method of preparation of various types of specimens and their testing procedures are provided. Flexure strength and modulus of rupture were determined in both the orthogonal directions. Influence of (a) thickness of the specimen, (b) direction of compacted layers with respect to the flexural tension developed and (c) effect of cement slurry coating between the compacted layers on the flexural strength of CSRE were examined. The investigations show that flexure strength increases with the increase in the specimen thickness and a coat cement slurry on the compacted layers leads to improvement in flexure strength. The flexural strength parallel to compacted layers is higher when compared to flexure strength perpendicular to compacted layers. Stress-strain relationships show that the initial tangent modulus of CSRE in saturated condition is about 60% of that in dry condition. Damping ratio as obtained from the free vibration studies is found to be 0.022 in the two orthogonal directions. Dynamic characteristics of CSRE building models are presented in Chapter 3. A simple alternative to shake table called as “Shock Table” was used in the present investigation for providing base motion to the building model. A half-scale CSRE building model with R.C lintels only above door and window openings (with no earthquake resistant features) was constructed on the Shock Table. The wall thickness of the building model was 100 mm. Procedure for construction, instrumentation and testing of the CSRE building model is presented. Responses measured and damages observed are discussed in detail. Finite element (FE) analyses were performed on six different building models with different earthquake resistant features using commercially available FE software (NISA V17). Both free vibration and forced vibration analyses were performed. Natural frequencies and forced vibration responses (acceleration) of building model (BM1) obtained from experiment and FE analysis were compared. Responses (free vibration and forced vibration) of other five building models were predicted using FE analysis. Crack patterns of the building models with roof and without roof are compared. The thesis ends with a summary of the results and concluding remarks in Chapter 4.